Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
UVtex FABRICS coating, 5182 aluminum alloy and glass fiber
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($40.58): BG10OFFAFF1
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): aff7off, vipupgrade8, 26d847, TTxBG10, BGss8%hl, bgssaff9, AFfbG10, BGXMUB25, BGUM259, BGTU923, 502C6B, BGUMBR24, BGBFAFF2019, BGCITYADS2019, BGBFI23, BGBGHFRI15, BGPUG249, BGVDay10%off, BGHOMEG12, BGAFF10OFF, bGhOnEy10, BGdragonBoat, bgshOOp10, BGHome15%, BGHOMEA15%, BGINEEDITUM, BGYUS891, BgcLuBofErtA10, BGBFHOME39, BGBFC024, BGXPDE2905, BGHTFEW3, 13f142, BGCuponation10, BGHONEY2110, BG10OFFAFF, BGAP3004, BGMAR0607, BGMAR2001, BGwhielabel, BGJUN153, BGJUY06, BGHU0762
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for Xiaomi Umbrella Black is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).